EP0341919A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Light attenuator and process for fabrication thereof

Assignee: Mitsubishi Chemical Corp

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Filing: 1989-05-05

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Granted: —

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Expires: 2009-05-05

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Abstract

Abstract Disclosed is a light attenuator comprising a stick or rod composed of a light-transmitting material, and a light-attenuating layer composed of a thermoplastic resin and formed on at least one end face of the stick or rod, wherein finely divided particles having a light-absorbing or light-scattering property are uniformly incorporated in the thermoplastic resin. This light attenuator is made by placing the thermoplastic resin on a release film or paper and heating and press-bonding to the end face of a light-transmitting rod or stick so that the light attenuating layer of thermoplastic resin is transferred to the end face of the rod or stick when the release film is removed.

Inventors

👤 Hiroshi Okada
👤 Shingo Suzuki
👤 Manabu Kagami
👤 Chiaki Suematsu

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-02 16:31

CPC Classifications

G; G02; G02F; G02F1/00; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/264; G02B6/266; G02B5/00; G02B5/20; G02B5/22; G02B6/36; G02B6/38; G02B6/3807; G02B6/3833; G02B6/3846; G02B6/42; G02B6/4201; G02B6/4204; G02B6/421; G02B6/3869

Claims Analysis

Total Claims: 7

Claim 1

Independent Claim 50 words

A light attenuator comprising a stick or rod composed of a light-transmitting material, and a light-attenuating layer and formed on at least one end face of the stick or rod, characterised in that the layer is composed of a thermoplastic resin in which absorbing or light-scattering property are uniformly incorporated.

Claim 2

Dependent Claim 50 words

Claim 3

Dependent Claim 39 words

A light attenuator as set forth in claim 1, which is inserted and set in a ferrule and arranged between a connector plug of a light transmission line of an optical fiber and a receptacle for the connector plug.

Claim 4

Dependent Claim 33 words

A light attenuator as set forth in claim 2, wherein the ferrule is integrally coupled with the receptacle and the connector plug through a connecting member attached to the outside of the ferrule.

Claim 5

Dependent Claim 37 words

A light attenuator as set forth in claim 1, wherein the light-attenuating layer is bonded to the end face of the stick or rod composed of the light-transmitting material by the heat transfer of the light-attenuating layer.

Claim 6

Dependent Claim 21 words

A light attenuator according to any preceding claim in which the diameter of the finely divided particles is at least 50nm.

Claim 7

Dependent Claim 118 words

A process for the fabrication of a light attenuator according to claim 1 which comprises forming a light-attenuating layer composed of a thermoplastic resin, in which finely divided particles having a light-absorbing or light-scattering property are uniformly incorporated, on a release film or paper: placing the light-attenuating layer formed on the release film or paper on a heating plate; press-bonding the end face of a rod or stick composed of a light-transmitting material inserted and set in the interior of a ferrule to the surface of the released film or paper; cooling the bonded assembly, and then peeling the release film or paper to transfer the light-attenuating layer to the end face of the light-transmitting rod or stick.

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